. Bulletin. Natural history; Natural history. Aug. 1981 Sule: Growth and Feeding of Bass 533. Fig. 7—Average weight percentage of major food categories utilized by young- of-the-year bass of different lengthis in Lake Sangcfiris dur- ing 1975. 10 20 30 W SO 60 70 30 90 100 110 120 130 140 150 160 170 180 190 2CK) 210 TOTAL LENGTH Of BASS Im) sizes and generally in great quantities. Dependence upon this food source was greatest for bass between 40 mm and 140 mrr in total length. Terrestrial and aerial insects were mainly consumed by bass between 70 mm and 170 mm. Consump- tion of these types of
. Bulletin. Natural history; Natural history. Aug. 1981 Sule: Growth and Feeding of Bass 533. Fig. 7—Average weight percentage of major food categories utilized by young- of-the-year bass of different lengthis in Lake Sangcfiris dur- ing 1975. 10 20 30 W SO 60 70 30 90 100 110 120 130 140 150 160 170 180 190 2CK) 210 TOTAL LENGTH Of BASS Im) sizes and generally in great quantities. Dependence upon this food source was greatest for bass between 40 mm and 140 mrr in total length. Terrestrial and aerial insects were mainly consumed by bass between 70 mm and 170 mm. Consump- tion of these types of insects, however, was generally lower than consumption of aquatic insects or fish. While fish were used as a food resource by bass as small as 22 mm, they were not a consistantly im- portant food item until bass reached a total length of 90-100 mm. As bass in- creased in length, there was a general in- crease in the utilization of fish as food. These findings agree well with Keast & Webb (1966) who found that young bass from 30 to 50 mm had a diverse diet of Cladocera, Ephemeroptera, Amphipoda, and Chironomidae, while fish were not predominant in the diet until bass reach- ed a length of 80 mm. These data are also similar to those reported by McCammon et al. (1964) who found that bass less than 66 mm in length fed on insects and plankton while larger bass primarily ate fish. Since bass from both areas of Lake Sangchris exhibited similar food habits, it was hypothesized that differences in growth rates near the end of the normal growing season resulted from decreased feeding in the intake arm. Although bass in the discharge arm continued to grow rapidly late in the season while those in the intake arm did not, the percentage of empty stomachs in bass from the two study areas did not support the hypothesis consistently. However, the frequency of empty stomachs may not be a reliable in- dicator of feeding rate, since factors such as the time of collection, rate of diges- ti
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